Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72a62acde8be58c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 20:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 58448c789d5dc7675397b60432d62dda SHA-1: 150bc501405494494694b3122d48775b3ba55421 SHA-256: e72a62acde8be58cac5c56469848b681d6e146a679af0c37bfa93918032ddd0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports the conclusion that this document serves as a gateway to other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://packagingandfoodmachinary.com/userfiles/file/dovuzazagav.pdf In PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/lanarufalorudupukako.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/3581961441.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/mitazomomekoj.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/44136718909.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/35366240536.pdfIn PDF document text
    • http://bushurov.ru/images/files/63111952459.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210920131936.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81903d396---xuzodu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161302d7bcd474---41484212367.pdfIn PDF document text
    • https://estoniapools.com/contents/files/80286904556.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/buramanudogukufalariv.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/92516256886.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/s2ccaco2jc1o02e3f623o3orbl/kozisulexokir.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133436f72a3f---53025582377.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/pawemisosekad.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/vemiwidinoru.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/surumi.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/63593498844.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/53316366168.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/kerunepogebixegemodofa.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/84134024011.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/38977599291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=snaptube+similar+appPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 14820 bytes
SHA-256: 136a8695275208a6421ec618ca15e5466f64801193b4aca891270b656dd0feca
font_02_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 10608 bytes
SHA-256: 2674dafb3c542509b7b84b36f08cff956de25ca63252eac197144fa1e4cc872e

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